Sounds like you may have damaged your clutch.
If you were still able to coast down the hill in reverse, the only way that could happen is if your clutch was slipping.
Frontier clutches are known to fail and the situation you described may have hasten it.
If you were still able to coast down the hill in reverse, the only way that could happen is if your clutch was slipping.
Frontier clutches are known to fail and the situation you described may have hasten it.